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Your transmission is bad. You have the 4T60-E (the E stands for for electronic) transmission. What is actually happening is that the Torque converter can't lock up. Your computer senses this after a couple attepts and automatically down shifts into 3rd gear and will not shift into 4th gear/overdrive. Your service engine soon light should come on when this occurs.
My '95 Regal GS coupe did the same thing. Tried replacing the fluid/filter and it didn't help. I replaced my tranny at 140,000 miles. No trouble since. On a side note, make sure that they do replace the vacuum modulator too because this can damage the new/rebuilt transmission.
My bill came to about $1400 including new torque converter, tranny rebuild and all labor. I would expect a bill around $1800 because I was told that the shop I took mine to was the cheapest in town, but they did do good work.
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